不同治理措施对秦巴山区渣场土壤养分与植被恢复的影响

Effects of Different Management on Soil Nutrient and Vegetation Restoration in Different Slag Yards of Qinba Mountain

通过对不同治理措施下渣场土壤养分状况的差异性进行分析,系统地探讨不同治理措施对渣场土壤养分含量和植被恢复的影响。结果表明:渣场形成初期土壤养分含量比较贫乏,但随着恢复年限的增加会有一定程度的增加趋势,不同恢复年限之间渣场土壤全氮、铵态氮、速效钾和有机质含量差异极显著(P<0.01),硝态氮含量差异显著(P<0.05),速效磷含量差异不显著;不同覆土厚度的渣场除了速效磷含量差异显著以外,其他土壤养分含量差异极显著,说明覆土厚度对渣场土壤养分含量和植被恢复有一定的作用;渣场形成初期,若进行人工恢复植被,会使渣场土壤养分在短期内小于自然恢复植被的渣场,但是随着恢复年限的增加,以及人工植被改良土壤的作用,从而使进行人工恢复植被的渣场土壤养分含量大于自然恢复植被的渣场。

The study analyzed the variation of soil nutrients in slag yards under different management conditions,and investigated the effects of different management on soil nutrients and vegetation restoration.The results showed that soil nutrients content were low in the early stage,but they increased with the recover age.Soil total nitrogen,ammonium nitrogen,available K and organic matter had significant difference among different recovery ages（P〈0.01）respectively.The nitrate nitrogen had significant difference at the level of P〈0.05,while soil available P had no difference;soil nutrients had significant difference between various thick earth in slag yard,which indicated that the thickness of slag yards had certain effect on the soil nutrient contents and vegetation restoration;at the early stage of the slag yards,soil nutrients contents in slag yards which were recovered by artificial vegetation were less than those not recovered by vegetation,however,soil nutrients contents in slag yards which were recovered by artificial vegetation would exceed that in soils unrecovered by vegetation with the increase of the recovery age.